#!/bin/bash
function s1_generate_a_series_of_file(){
int index;
for(( index=1; index<=100;index++))
do 
 touch new_file{index}
done
}

function s2_list_4_file_in_long_format_about_account_and_group(){
echo "ls -lr /etc"
}
function s3_find_items_related_to_given_username() {
	grep -h $1 /etc/passwd /etc/shadow|sort -d
}

function s4_find_items_related_to_given_group_name() {
	grep -h $1 /etc/group /etc/gshadow|sort -d 
}

function s5_create_groups_for_given_group_names() {
	groupadd rnd&&groupadd itoperation
}

function s6_create_users_and_set_their_group_as_required() {
	useradd -G rnd adam && useradd -G rnd bob && useradd -G itoperation calvin && useradd -G itoperation david && useradd -G rnd edward
}

function s7_change_users_shell() {
	usermod -s /usr/bin/sh adam && usermod -s /usr/bin/sh edward
}

function s8_set_password_change_policy() {
	passwd -n 10 -x 60 -w 10 adam && passwd -n 10 -x 60 -w 10 bob && passwd -n 10 -x 60 -w 10 david && passwd -n 10 -x 60 -w 10 calvin && passwd -n 10 -x 60 -w 10 edward
}

function s9_set_password_for_five_users() {
usernames=(adam bob calvin david edward)
for i in $(seq 1 5);do echo ${!i};echo $(( $i-1 ));done
echo "${usernames[0]}:$1" | chpasswd
echo "${usernames[1]}:$2" | chpasswd
echo "${usernames[2]}:$3" | chpasswd
echo "${usernames[3]}:$4" | chpasswd
echo "${usernames[$(( $i-1 ))]}:$5" | chpasswd
}

function s10_lock_bobs_password() {
	usermod -L bob 
}
function s11_include_adam_into_wheel_group() {
	usermod -a -G wheel adam
}
function s12_change_files_permission() {
	for i in {1..33};do chmod -R 640 /tmp/new_file$[3*i]; done
}
